133561206689 has 2 divisors, whose sum is σ = 133561206690. Its totient is φ = 133561206688.

The previous prime is 133561206671. The next prime is 133561206731. The reversal of 133561206689 is 986602165331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72999934225 + 60561272464 = 270185^2 + 246092^2 .

It is a cyclic number.

It is not a de Polignac number, because 133561206689 - 2⁸ = 133561206433 is a prime.

It is not a weakly prime, because it can be changed into another prime (133561206619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66780603344 + 66780603345.

It is an arithmetic number, because the mean of its divisors is an integer number (66780603345).

Almost surely, 2^133561206689 is an apocalyptic number.

It is an amenable number.

133561206689 is a deficient number, since it is larger than the sum of its proper divisors (1).

133561206689 is an equidigital number, since it uses as much as digits as its factorization.

133561206689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 133561206689 in words is "one hundred thirty-three billion, five hundred sixty-one million, two hundred six thousand, six hundred eighty-nine".